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Cholinergic Antagonists: Pharmacokinetics

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Cholinergic antagonists—such as antimuscarinics—are available in oral, topical, ocular, parenteral, and inhalational formulations. Most antimuscarinics are oral formulations, while scopolamine is available as a topical patch, and ipratropium and tiotropium are available as inhalation aerosols or powders. Atropine, tropicamide, and cyclopentolate are topically instilled in the eye. Most antimuscarinics are lipid-soluble and readily absorbed from the gastrointestinal tract and the conjunctiva.

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Cholinergic antagonists bind to cholinergic receptors and limit the effects of acetylcholine and other cholinergic agonists. Based on the specific cholinergic receptor affinity, these antagonists are classified as muscarinic or nicotinic. Anticholinergics interrupt parasympathetic innervations while sympathetic innervations remain uninterrupted. Muscarinic antagonists are also called 'muscarinic antagonists', 'antimuscarinics', or 'parasympatholytics'. Nicotinic antagonists are called...

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Physical Properties of Amines

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Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.

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Synthesis of Masarimycin, a Small Molecule Inhibitor of Gram-Positive Bacterial Growth

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Published on: January 7, 2022

Mesaconitine.

Dao-Hang He, Yong-Chuang Zhu, Ai-Xi Hu

Acta Crystallographica. Section E, Structure Reports Online

|January 5, 2011

Summary

This summary is machine-generated.

Crystallographic characterization of a novel diterpenoid alkaloid from Aconitum kusnezoffii roots reveals its complex structure. Intermolecular interactions form a two-dimensional network, offering insights into its molecular assembly.

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Area of Science:

Natural Products Chemistry
Organic Chemistry
Crystallography

Background:

Aconitum kusnezoffii is a plant source of bioactive compounds.
Diterpenoid alkaloids represent a significant class of natural products with diverse biological activities.
Structural elucidation of novel alkaloids is crucial for understanding their properties and potential applications.

Purpose of the Study:

To perform crystallographic characterization of a specific diterpenoid alkaloid isolated from Aconitum kusnezoffii.
To determine the detailed three-dimensional structure and conformation of the compound.
To investigate the intermolecular interactions and crystal packing.

Main Methods:

Single-crystal X-ray diffraction analysis was employed for structural determination.
Conformational analysis of the various rings within the molecule was performed.
Identification and analysis of hydrogen bonding patterns (inter- and intra-molecular) were conducted.

Main Results:

The title compound, a C19 diterpenoid alkaloid (C33H45NO11), was successfully characterized.
Specific ring conformations were identified: chair (A, B, E), envelope (C, F), and boat (D).
Inter- and intra-molecular hydrogen bonds were observed, including the formation of a non-planar seven-membered ring and a 2D network.

Conclusions:

The study provides the first crystallographic data for this specific diterpenoid alkaloid.
The detailed structural information elucidates the molecule's conformation and hydrogen bonding network.
The observed intermolecular interactions suggest a specific crystal packing arrangement.